| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: libcpp-has-no-incomplete-ranges |
| |
| // constexpr bool __has_value() const; |
| |
| #include <ranges> |
| |
| #include <cassert> |
| |
| template <class T> |
| constexpr void test() { |
| using Cache = std::ranges::__non_propagating_cache<T>; |
| |
| // __has_value on an empty cache |
| { |
| Cache const cache; |
| assert(!cache.__has_value()); |
| } |
| |
| // __has_value on a non-empty cache |
| { |
| Cache cache; cache.__emplace(); |
| assert(cache.__has_value()); |
| } |
| } |
| |
| struct T { }; |
| |
| constexpr bool tests() { |
| test<T>(); |
| test<int>(); |
| return true; |
| } |
| |
| int main(int, char**) { |
| static_assert(tests()); |
| tests(); |
| return 0; |
| } |